Cossidas 



Genus PRIONOXYSTUS Grote 



There are two species of this genus found in the United 

 States. One of them, Priouoxystiis macmiirtrei Guerin-Mene- 

 ville == querciperda Fitch, is a rather rare species, it bores its larval 

 passages in oak. The female, which resembles the female of the 

 other species, is quite large, sometimes four inches in expanse of 

 wing. The male, on the other hand, is quite diminutive. I have 

 never seen a male much more than an inch and a half in expanse 

 of wing. The species has been taken most frequently in recent 

 years in western Pennsylvania by local collectors. The other 

 species, Prionoxystus robiniae Peck, is very common. It fre- 

 quents various trees, but shows a preference for the wood of the 

 common locust {Robiuia pseiidacacij) and various species of 

 the genus Popnlus. The male is depicted on Plate XLl, Fig. ii, 

 and the female by Fig. lo on the same plate. The insect is 

 widely distributed throughout the United States, i have found 

 the males exceedingly abundant about the electric lights in some 

 of our Western cities, as St. Paul and Omaha. 



Genus INGUROMORPHA Henry Edwards 



Two species of this genus occur within 

 our limits. Both are found in the extreme 

 southern portions of the United States. /. 

 arbtioides Dyar is a native of Arizona. I. 

 basalis Walker, which is shown in the an- 

 nexed figure, is found in Florida and Mexico. 



The general color of the fore wings is pale 



ashen-gray, with the outer border dull ochre- 



ous, marked with dark-brown striae, and 



broader spots and blotches toward the outer 



The hind wings are darker gray. 



Fig. 2iT,.—Iiigiiro- 



inorpha basalis, 5 • {• 

 Type of slossoiii. 



margin 



" I recognize 

 The moths, with that great overpoise of wings 

 Which makes a mystery of them how at all 

 They can stop flying." 



E. B. Browning. —.-///nvv/ Z<'/>/4. 



57^ 



